tests: add bgp colored extended community test

Signed-off-by: Francois Dumontet <francois.dumontet@6wind.com>

tests/topotests/bgp_color_extcommunities/r1/bgpd.conf

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+!
+router bgp 65001
+ bgp router-id 192.168.1.1
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 192.168.1.2 remote-as external
+ address-family ipv4 unicast
+  network 10.10.10.10/24 route-map rmap
+  neighbor 192.168.1.2 route-map rmap out
+  neighbor 192.168.1.2 activate
+ exit-address-family
+!
+route-map rmap permit 10
+ set extcommunity color 1
+ set extcommunity rt 80:987
+ set extcommunity color 100 55555 200
+exit

tests/topotests/bgp_color_extcommunities/r1/zebra.conf

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+!
+int r1-eth0
+ ip address 192.168.1.1/24

tests/topotests/bgp_color_extcommunities/r2/bgpd.conf

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+router bgp 65002
+ bgp router-id 192.168.1.2
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as external

tests/topotests/bgp_color_extcommunities/r2/zebra.conf

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+!
+int r2-eth0
+ ip address 192.168.1.2/24
+!

tests/topotests/bgp_color_extcommunities/test_bgp_color_extcommunities.py

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+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+# Copyright 2022 6WIND S.A.
+# Copyright 2023 6WIND S.A.
+# François Dumontet <francois.dumontet@6wind.com>
+#
+
+
+"""
+test_bgp_color_extcommunity.py: Test the FRR BGP color extented
+community feature
+"""
+
+import os
+import sys
+import json
+import functools
+from functools import partial
+import pytest
+
+# Save the Current Working Directory to find configuration files.
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+# Import topogen and topotest helpers
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+from lib.topolog import logger
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def build_topo(tgen):
+    "Build function"
+
+    for routern in range(1, 3):
+        tgen.add_router("r{}".format(routern))
+
+    switch = tgen.add_switch("s1")
+    switch.add_link(tgen.gears["r1"])
+    switch.add_link(tgen.gears["r2"])
+
+
+def setup_module(mod):
+    "Sets up the pytest environment"
+
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+    logger.info("setup_module")
+
+    router_list = tgen.routers()
+
+    for rname, router in router_list.items():
+        router.load_config(
+            TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
+        )
+
+    # Initialize all routers.
+    tgen.start_router()
+
+
+def teardown_module(_mod):
+    "Teardown the pytest environment"
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_color_extended_communities():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+    r2 = tgen.gears["r2"]
+
+    def _bgp_converge():
+        output = json.loads(r1.vtysh_cmd("show bgp summary json"))
+        expected = {
+            "ipv4Unicast": {
+                "peers": {
+                    "192.168.1.2": {
+                        "pfxSnt": 1,
+                        "state": "Established",
+                    },
+                }
+            }
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_converge)
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "Failed announcing 10.10.10.10/32 to r2"
+
+    def _bgp_check_route(router, exists):
+        output = json.loads(router.vtysh_cmd("show bgp ipv4 unicast 10.10.10.10 json"))
+        if exists:
+            expected = {
+                "prefix": "10.10.10.0/24",
+                "paths": [
+                    {
+                        "valid": True,
+                        "extendedCommunity": {
+                            "string": "RT:80:987 Color:100 Color:200 Color:55555"
+                        },
+                    }
+                ],
+            }
+        else:
+            expected = {}
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_check_route, r2, True)
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "10.10.10.0/24 ext community is correctly not installed, but SHOULD be"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))